Malicious PDF — malware analysis report

Static analysis result for SHA-256 8324215c3396ab50…

MALICIOUS

PDF

86.6 KB Created: 2021-03-04 00:20:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 5c5e66c08b339bb837c620439c82cf5b SHA-1: e83c81c58169d5f5b58fd213486ae32e2833ab65 SHA-256: 8324215c3396ab50ad2a9572ce30394f502717c5005cbbbbfdf663be5980e9e6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are structured as SEO-optimized links, suggesting a link farm or spamming operation. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the presence of numerous external URIs indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xezojetit.ru/123?utm_term=bose+sounddock+series+ii+wireless+adapter PDF link annotation
    • http://rejemezurufoveg.mywebcommunity.org/information_technology_degree_online_reddit.pdfIn PDF document text
    • https://sikefenuvip.weebly.com/uploads/1/3/4/0/134012601/5b6144.pdfIn PDF document text
    • http://relibafogat.sportsontheweb.net/didukezaludubogiramexofo.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/gusipumefoxopuwinexipizir.pdfIn PDF document text
    • https://pudabesipewoz.weebly.com/uploads/1/3/0/9/130969441/kejimavapimudebujisa.pdfIn PDF document text
    • https://cdn.sqhk.co/pevedapev/ghifedU/neighbourhood_crossword_clue_6_letters_mean.pdfIn PDF document text
    • https://soxodoma.weebly.com/uploads/1/3/4/6/134695887/7754427.pdfIn PDF document text
    • https://sunitago.weebly.com/uploads/1/3/1/8/131856801/tovijuwitaxe-nakifatado.pdfIn PDF document text
    • https://repotadidutu.weebly.com/uploads/1/3/4/3/134310826/6069870.pdfIn PDF document text
    • http://sitizinudex.getenjoyment.net/86739482118.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/joludosifevofajerov.pdfIn PDF document text
    • http://zabuzuko.epizy.com/dukami.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/pmbok_guide_6th_edition_and_agile_practice_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/android_tv_setup_box.pdfIn PDF document text
    • http://pudolajuji.atwebpages.com/jigedegakitinix.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/alienware_laptop_gaming_performance.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B4 5272 bytes
SHA-256: d884049408529efdbb13147b16e690207939f43b680735180251d08b6061f265
font_01_sfnt_off000124c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C7 11852 bytes
SHA-256: 783f5c30891c8c660fd86bbf20c00a59a5ef94235fdfc46abb40e62c80d743fb

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